Knowing when to replace your gas boiler can greatly improve the overall cost of heating your home as well as your quality of life. By researching your new boiler well before the old one finally breaks down, you’ll be able to replace it more quickly. In areas where temperatures regularly drop below zero degrees Fahrenheit or where snowstorms are a regular part of winter, it’s advisable to replace your gas boiler before it splutters to its end to avoid a sudden breakdown in the throes of winter’s coldest days. In addition, if you have an old gas boiler, it’s likely that its relatively low efficiency is costing you extra money to run each month. According to Energy Savers, replacing a 60-percent-efficient boiler with a new 90-percent-efficient model will save you money off heating costs.